Improved plate for artificial teeth



UNITED :STATES: PATENT OFTTcE.

GEORGE MORRISON, OF LOCKPORT, ILLINOIS.

IMPROVED PLATE FOR ARTIFICIAL TEETH.

Specification forming part of Letters Patent No. 88,798, dated April 13, 1869.

.To all whom it may concern: l edge of the air-chamber, which serves as a Beit known that I, GEORGE MORRISON, of wall around the same and a barrier to the air Lockport, in Will county and State of Illinois, from without. This projection easily embeds have invented a new and useful Improvement itself into the fleshy part of the root' of the in Plates for Artificial Teeth; and that the folmouth, and is not painful or difficult to wear. lowing is a full, clear, and exact description of It will be readily seen that the projection or the same, reference being had to the annexed wally must be of great service in preventing drawings, making a part of this specification, the ingress of air into the chamber by comin whichpeiling it to pass over it, which would be diffi- Figure 1 is a plan view on the top, and Fig. cult on account of its being embedded into 2 a cross-sectional view of the same on the the roof ot' the mouth. This projection may line be used on any kind of plate, whether vulcan- One of the greatest difficulties and annoyite or metal, and on any part thereof that it ances experienced by persons obliged to wear may be necessary to be used. artificial teeth (especially the upper set) is that lt will also be seen that if the plate lshould the plates are continually dropping out on acnot exactly t the roof of the mouth the iange count of the air from without finding ingress will prevent the air from inding ingress just into the air-chamber usually made in the roof as well, and it would be no more liable to fall of the plate. This air-chamber is the best out than if the lit were good. means employed to hold suction-plates up into Olm-m8 their place, by means of exhausting the air therefrom, which causes a vacuum between Having thus described my invention, what the roof of the mouth and the plate, so that I claim as new, and desire to secure by Letthe pressure of the air on the plate holds it ters Patent, isrm in place; but, however, it is well known 1. The annular projection or wall a., surthat to'allow the least quantity of air from rounding the air-chamber c, constructed and without into the air-chamber will immediately arranged as and for the purposes set forth. cause it to relax its pressure to the roof of the 2. Preventing the air from without from en- Y mouth, and will finally'drop entirely down and tering the air-chamber c by means of an elefall out.

My invention consists in a device expressly for thc purpose of obviating this difficulty, by so constructing the air-chamber c that the air l cannot so easily iind ingress, which I do by constructing a flange or annular elevated pro` jection (shown at a., Figs. 1 and 2) around the substantially as described.

l vated projection or wall surrounding the same,

GEO. MORRISON.

Witnesses:

THos. H. HUTcHINs, G. lV. SIssEN. 

